Answer: Isotopes of an atom are different because they have different atomic masses and different number of neutrons within their nucleus. They are the same since they will always have the same atomic number/number of protons in their nucleus.
Explanation:
Mg- is the isoelectronic of Na
Answer:
It would be 6.9420. Thank me later
All three vehicles have the same kinetic energy because they have equal speed.
YES IT'S @LL CORRECT
